37 lines
1.3 KiB
C#
37 lines
1.3 KiB
C#
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namespace System.Web.Mvc {
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using System;
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using System.Web;
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public class HttpPostedFileBaseModelBinder : IModelBinder {
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public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) {
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if (controllerContext == null) {
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throw new ArgumentNullException("controllerContext");
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}
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if (bindingContext == null) {
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throw new ArgumentNullException("bindingContext");
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}
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HttpPostedFileBase theFile = controllerContext.HttpContext.Request.Files[bindingContext.ModelName];
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return ChooseFileOrNull(theFile);
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}
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// helper that returns the original file if there was content uploaded, null if empty
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internal static HttpPostedFileBase ChooseFileOrNull(HttpPostedFileBase rawFile) {
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// case 1: there was no <input type="file" ... /> element in the post
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if (rawFile == null) {
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return null;
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}
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// case 2: there was an <input type="file" ... /> element in the post, but it was left blank
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if (rawFile.ContentLength == 0 && String.IsNullOrEmpty(rawFile.FileName)) {
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return null;
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}
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// case 3: the file was posted
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return rawFile;
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}
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}
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}
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